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NYHA functional classification for heart failure

Physical ability
Patients with cardiac disease, but without limitation of physical activity. Ordinary physical activity does not cause undue fatigue, palpitation, or dyspnea.
Patients with cardiac disease resulting in slight limitation of physical activity. Comfortable at rest, but ordinary physical activity results in fatigue, palpitation, or dyspnea.
Patients with cardiac disease resulting in marked limitation of physical activity. Comfortable at rest, but less than ordinary activity causes fatigue, palpitation, dyspnea or anginal pain.
Patients with cardiac disease resulting in inability to carry on any physical activity without discomfort. Symptoms of HF at rest, if any physical activity is undertaken, discomfort increases.
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Reference
L Goldman, B Hashimoto, E F Cook et al. Comparative reproducibility and validity of systems for assessing cardiovascular functional class: advantages of a new specific activity scale. Circulation. 1981 Dec;64(6):1227-34.
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